DOCSLIB.ORG

Huble-UK: Hudson Bay Lithospheric Experiment

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Huble-UK: Hudson Bay Lithospheric Experiment HuBLE-UK: Hudson Bay Lithospheric Experiment Ian Bastow, J-Michael Kendall, George Helffrich, James Wookey, David Thompson SEIS-UK & HuBLE Working Group [email protected] Department of Earth Sciences, University of Bristol, UK PROJECT OVERVIEW SEISMIC STATION CONSTRUCTION RECEIVER FUNCTION ANALYSES We are conducting a broadband seismological experiment in Nunavut in order to understand better the origins of We deployed 10 broadband seismic stations during summer 2007. 4 sites are housed in secure compounds in As we collect data from the field, we will perform multiple analyses on our seismic data. Receiver function Hudson Bay. Our 10 remote and community based stations complement the broader “POLARIS” network of Community locations: Pangnirtung, Cape Dorset, Kimmirut and Coral Harbour. 6 stations are in remote analyses (Figure 6) will allow us to analyze velocity discontinuities beneath Hudson Bay. In addition to bulk stations currently operating in the region. Our data will enable us to test hypotheses of root formation and the locations across the northern part of Hudson Bay: Southampton Island (3), Mansel Island, Coats Island, crustal properties (layer thickness and P/S wavespeed ratio) we can investigate the existence of an eclogite persistence of intra-cratonic basins via a range of broadband seismological analyses such as travel-time Mingo Lake and Nottingham Island. While the community stations are run by mains power, our remote sites root beneath the Bay that may be partly responsible for the formation of the basin. tomography, receiver function analyses and SKS shear wave splitting. Some of the major questions we hope to are powered by solar panels; instrumentation are housed in secure steel containers (below). P-to-S conversions generated deeper in the mantle at ~410 and ~660km depth will be deflected up or answer through HuBLE are: down in response to variations in temperature (Figure 7). Thus we will be able to understand better the mantle flow patterns beneath Hudson Bay. • What is the structure and evolution of lithospheric roots and their dynamic interaction with mantle flow? Batteries • How has this intra-cratonic basin formed? Figure 6: Moho structure from • What is the lithospheric structure of the Trans-Hudson Orogen beneath Hudson Bay and the nature of the Satellite modem receiver function analyses. An eclogite root at the base of the GPS antenna Nastapoka Arc? Hudson Bay crust will result in a more • What is the nature of post glacial re-bound in Hudson Bay, and what is its effects on seismicity in this gradational velocity profile than when continental interior region? normal mantle peridotite directly underlies a granitoid crust. Receiver Recording unit function analyses are sensitive to Data will be available to us later this year after the first station service run. Satellite modems at our stations Power regulator these velocity structures - more allow us to monitor the state of health of our stations. After a short period (~3-4 weeks) during the shortest impulsive P-to-S conversions are winter days when we lost power at all stations, the network now appears to be operating well. predicted in the no-eclogite case. After Zandt and Gilbert (2007). Solar panels Figure 7: Investigating the mantle transition zone using receiver Hudson Bay function analyses. (A) In the high Seismometer temperature environment, the 410km discontinuity is depressed and the 660 uplifted, resulting in a thinner transition zone. The opposite effect can be seen in the low temperature region. (B) P-to-S conversions at the transition zone. Modified from Lebedev et al., (2002). SEISMIC TOMOGRAPHY With a network aperture of ~2000km we will be able to image mantle seismic structures to depths below the transition zone using seismic travel-time tomography. P- and S-wave images will offer lateral resolution of variations in the nature of the lithospheric root and the flow of mantle material around it. VP/VS ratios will Figure 2: S-wave velocity perturbations provide a means of distinguishing between compositional and thermal effects. Figure 1: Gravity images from the GRACE at 200 km depth from global model 0 (A) project. Note the long wavelength anomaly SAW24B16 (Megnin & Romanowicz, (83°N, 51°W) that characterizes the Hudson Bay region. 2000). The 3% contour outlines the ) 100 (83°N, 110°W) m www.csr.utexas.edu/grace/gallery/gravity k ( approximate region of the tectospheric h t root beneath Laurentia. p 200 e Craton D Asthenosphere Asthenosphere ? Eroded 300 ? INTRODUCTION AND SCIENTIFIC RATIONALE Figure 3 (above): HuBLE-UK remote ? Despite being one of the most striking features of the North America continent, the reason for the station construction. 20-40W solar panels (B) 0 on a steel frame re-charge 3×100Ah existence of Hudson Bay is obscure. It lies in the Precambrian core of North America, which is batteries that power the seismometer and ) 100 m k ( recording equipment. The GPS antenna comprised of the Canadian Shield and contiguous platform regions (Laurentia: Hoffman, 1988). h t Craton p 200 provides continuous accurate timing e ? Intact ? D Asthenosphere Asthenosphere The region is underlain by the largest continental root on Earth and is the site of one of the largest information for our data. We communicate negative geoid anomalies (Figure 1); it is also characterized by a broad high-velocity zone with the stations remotely via the satellite 300 ? illuminated in global tomographic models (Figure 2). Only part of the gravity anomaly can be modems that are scheduled to operate twice weekly. attributed to post-glacial isostatic rebound, however, and lithospheric instabilities (Houseman et al., 2000), plume-related lithospheric densification (Kaminski & Jaupart, 2000), the existence of Figure 4 (left): Broadband seismic an eclogite lower crust (Baird et al., 1995) and extension (Roksandic, 1987) are amongst the recording stations throughout the Hudson Figure 8 (above): Vertical cross- various mechanisms proposed to explain the field observations in Hudson Bay. Bay area. HuBLE-UK stations are also sections through end-member shown in the inset figure. models for a craton. A: Lithosphere of the Archean craton has been eroded The Trans-Hudson Orogen, a vast paleo-Proterozoic orogenic belt, played an important role in the and replaced by low density asthenosphere. B: Craton is intact and assembly of Laurentia. It is characterized by extreme salient-reentrant geometry possibly has a lithospheric thickness of more analogous to the western syntaxis of the Himalayan front, but its origins are unknown. Its than 200km. Modified after Ritsema et geometry may reflect a primary shape of the Superior craton and its strong mantle root, but the al., (1998). (45°N, 51°W) current shape of the keel is not well resolved. In the same vicinity, the SE corner of Hudson Bay exhibits a nearly semi-circular coastline known as the Nastapoka Arc. Hypotheses for its REMOTE STATION MODEM CONNECTIONS Figure 9: Knot locations for taut spline parametrization. We The satellite modem facility installed at our remote sites has proved invaluable so far. After all parametrize P- and S-wave slowness using B-splines under tension formation range from meteorite impacts to Archean basement fabrics so we also seek 1800km over a dense grid of knots (Cline 1981). Interpolation between observational constraints here via our experiment. stations powered up after New Year power-downs due to short day-times, two stations slowness values at each knot allows the generation of smooth experienced seismometer and recording equipment problems. These were rectified remotely velocity models through which ray tracing can be performed. The from our UK base-station resulting in us obtaining ~10 months of extra data. Once-weekly equilateral grid consists of 31 knots in depth between 0-1800km, 90 ACKNOWLEDGEMENTS (45°N, 110°W) knots in latitude between 45-83°N and 82 knots in longitude between 51-110°W for a total of 22870 knots parametrizing velocity SEIS-UK have provided invaluable assistance with our field deployment and subsequent remote access of remote sites. The HuBLE-UK monitoring of station power, GPS status and seismometer stability also allow us to prioritise structure. project was funded by NERC grant NE/D012317/1. Logistical support from the CNGO and GSC is also gratefully acknowledged. our efforts at service runs..
Load more

Recommended publications
  • C S a S S C C S
    C S A S S C C S Canadian Science Advisory Secretariat Secrétariat canadien de consultation scientifique Research Document 2010/066 Document de recherche 2010/066 Ecosystem status and trends report: Rapport de l’état des écosystèmes et Arctic Marine Ecozones des tendances : écozones marines de l’Arctique Andrea Niemi, Joclyn Paulic and Don Cobb Fisheries and Oceans Canada / Pêches et Océans Canada Central & Arctic Region / Région du Centre et de l’Arctique 501 University Crescent / 501, University Crescent Winnipeg, MB R3T 2N6 This series documents the scientific basis for the La présente série documente les fondements evaluation of aquatic resources and ecosystems scientifiques des évaluations des ressources et in Canada. As such, it addresses the issues of des écosystèmes aquatiques du Canada. Elle the day in the time frames required and the traite des problèmes courants selon les documents it contains are not intended as échéanciers dictés. Les documents qu’elle definitive statements on the subjects addressed contient ne doivent pas être considérés comme but rather as progress reports on ongoing des énoncés définitifs sur les sujets traités, mais investigations. plutôt comme des rapports d’étape sur les études en cours. Research documents are produced in the official Les documents de recherche sont publiés dans language in which they are provided to the la langue officielle utilisée dans le manuscrit Secretariat. envoyé au Secrétariat. This document is available on the Internet at: Ce document est disponible sur l’Internet à: http://www.dfo-mpo.gc.ca/csas/ ISSN 1499-3848 (Printed / Imprimé) ISSN 1919-5044 (Online / En ligne) © Her Majesty the Queen in Right of Canada, 2010 © Sa Majesté la Reine du Chef du Canada, 2010 TABLE OF CONTENTS / TABLE DES MATIÈRES ABSTRACT................................................................................................................................
    [Show full text]
  • Of the Inuit Bowhead Knowledge Study Nunavut, Canada
    english cover 11/14/01 1:13 PM Page 1 FINAL REPORT OF THE INUIT BOWHEAD KNOWLEDGE STUDY NUNAVUT, CANADA By Inuit Study Participants from: Arctic Bay, Arviat, Cape Dorset, Chesterfield Inlet, Clyde River, Coral Harbour, Grise Fiord, Hall Beach, Igloolik, Iqaluit, Kimmirut, Kugaaruk, Pangnirtung, Pond Inlet, Qikiqtarjuaq, Rankin Inlet, Repulse Bay, and Whale Cove Principal Researchers: Keith Hay (Study Coordinator) and Members of the Inuit Bowhead Knowledge Study Committee: David Aglukark (Chairperson), David Igutsaq, MARCH, 2000 Joannie Ikkidluak, Meeka Mike FINAL REPORT OF THE INUIT BOWHEAD KNOWLEDGE STUDY NUNAVUT, CANADA By Inuit Study Participants from: Arctic Bay, Arviat, Cape Dorset, Chesterfield Inlet, Clyde River, Coral Harbour, Grise Fiord, Hall Beach, Igloolik, Iqaluit, Kimmirut, Kugaaruk, Pangnirtung, Pond Inlet, Qikiqtarjuaq, Rankin Inlet, Nunavut Wildlife Management Board Repulse Bay, and Whale Cove PO Box 1379 Principal Researchers: Iqaluit, Nunavut Keith Hay (Study Coordinator) and X0A 0H0 Members of the Inuit Bowhead Knowledge Study Committee: David Aglukark (Chairperson), David Igutsaq, MARCH, 2000 Joannie Ikkidluak, Meeka Mike Cover photo: Glenn Williams/Ursus Illustration on cover, inside of cover, title page, dedication page, and used as a report motif: “Arvanniaqtut (Whale Hunters)”, sc 1986, Simeonie Kopapik, Cape Dorset Print Collection. ©Nunavut Wildlife Management Board March, 2000 Table of Contents I LIST OF TABLES AND FIGURES . .i II DEDICATION . .ii III ABSTRACT . .iii 1 INTRODUCTION 1 1.1 RATIONALE AND BACKGROUND FOR THE STUDY . .1 1.2 TRADITIONAL ECOLOGICAL KNOWLEDGE AND SCIENCE . .1 2 METHODOLOGY 3 2.1 PLANNING AND DESIGN . .3 2.2 THE STUDY AREA . .4 2.3 INTERVIEW TECHNIQUES AND THE QUESTIONNAIRE . .4 2.4 METHODS OF DATA ANALYSIS .
    [Show full text]
  • 2019 Arctic Marine Biodiversity Monitoring Plan Implementation
    CANADA 2019 Arctic Marine Biodiversity Monitoring Plan Implementation The Arctic Marine Biodiversity Monitoring Plan is the Marine component of the Conservation of Arctic Flora and Fauna (CAFF)’s Circumpolar Biodiversity Monitoring Program (CBMP). The CBMP is an international network of scientists, governments, Indigenous organizations and conservation groups working to harmonize and integrate efforts to monitor the Arctic’s living resources. It consists of four Monitoring Plans (marine, coastal, freshwater and terrestrial) that integrate existing monitoring and data to better understand changes in Arctic biodiversity. CBMP-Marine is organized through a Marine Steering Group and six Expert Networks (Sea ice biota, Plankton, Benthos, Fishes, Seabirds and Marine mammals). These networks provide the framework to implement the CBMP Arctic Marine Biodiversity Monitoring Plan (CBMP-Marine Plan) and to facilitate more rapid detection, communication, and response to the significant biodiversity-related trends and pressures affecting the circumpolar Arctic. CBMP-Marine engages more than 75 scientists and representatives of Arctic Council states, Permanent Participants and Observer countries. CBMP-Marine connections to activities in Canada • Development of Fisheries and Oceans Canada’s (DFO) State of the Arctic Ocean report, to inform both technical and public audiences on the current status and knowledge of the Canadian Arctic marine environment. • Progress towards national marine conservation targets, including collaborative work with Indigenous peoples, governments, and international partners to explore how best to understand, protect and manage Canada’s High Arctic, i.e., Tuvaijuittuq (High Arctic Basin). • Ratification of the international Agreement to Catching thick-billed murres at Coats Island, Nunavut. Prevent Unregulated High Seas Fisheries in the Photo credit: Sarah Poole.
    [Show full text]
  • Statutory Report on Wildlife to the Nunavut Legislative Assembly Section 176 of the Wildlife Act
    Statutory Report on Wildlife to the Nunavut Legislative Assembly Section 176 of the Wildlife Act 1.0 Review of Wildlife and Habitat Management Programs for Terrestrial Species in Nunavut…………………………………………………………….1 1.1 Wildlife Act and Wildlife Regulations………………………………………………..2 1.2 Qikiqtaaluk Region……………………………………………………………………2 1.2.1 Qikiqtaaluk Research Initiatives…………………………………………………….2 a. Peary caribou………………………………………………………………………….2 b. High Arctic muskox…………………………………………………………………...3 c. North Baffin caribou…………………………………………………………………..4 1.2.2 Qikiqtaaluk Management Initiatives………………………………………………...5 a. Peary Caribou Management Plan……………………………………………………...5 b. High Arctic Muskox…………………………………………………………………..5 c. South Baffin Management Plan……………………………………………………….6 1.3 Kitikmeot Region……………………………………………………………………...8 1.3.1 Kitikmeot Research Initiatives………………………………………………………9 a. Wolverine and Grizzly bear Hair Snagging………………………………………….. 9 b. Mainland Caribou Projects……………………………………………………………9 c. Boothia Caribou Project……………………………………………………………...10 d. Dolphin and Union Caribou Project……………………............................................10 e. Mainland and Boothia Peninsula Muskoxen………………………………………...11 f. Harvest and Ecological Research Operational System (HEROS)…………………...12 g. Vegetation Mapping……………………………………………………………….....12 1.3.2 Kitikmeot Management Initiatives…………………………………………………12 a. Grizzly Bear Management…………………………………………………………...12 b. Bluenose East Management Plan…………………………………………………….12 c. DU Caribou Management Plan………………………………………………………13 d. Muskox Status
    [Show full text]
  • Proceedings Template
    Canadian Science Advisory Secretariat (CSAS) Research Document 2020/032 Central and Arctic Region Ecological and Biophysical Overview of the Southampton Island Ecologically and Biologically Significant Area in support of the identification of an Area of Interest T.N. Loewen1, C.A. Hornby1, M. Johnson2, C. Chambers2, K. Dawson2, D. MacDonell2, W. Bernhardt2, R. Gnanapragasam2, M. Pierrejean4 and E. Choy3 1Freshwater Institute Fisheries and Oceans Canada 501 University Crescent Winnipeg, MB R3T 2N6 2North/South Consulting Ltd. 83 Scurfield Blvd, Winnipeg, MB R3Y 1G4 3McGill University. 845 Sherbrooke Rue, Montreal, QC H3A 0G4 4Laval University Pavillon Alexandre-Vachon 1045, , av. of Medicine Quebec City, QC G1V 0A6 July 2020 Foreword This series documents the scientific basis for the evaluation of aquatic resources and ecosystems in Canada. As such, it addresses the issues of the day in the time frames required and the documents it contains are not intended as definitive statements on the subjects addressed but rather as progress reports on ongoing investigations. Published by: Fisheries and Oceans Canada Canadian Science Advisory Secretariat 200 Kent Street Ottawa ON K1A 0E6 http://www.dfo-mpo.gc.ca/csas-sccs/ [email protected] © Her Majesty the Queen in Right of Canada, 2020 ISSN 1919-5044 Correct citation for this publication: Loewen, T. N., Hornby, C.A., Johnson, M., Chambers, C., Dawson, K., MacDonell, D., Bernhardt, W., Gnanapragasam, R., Pierrejean, M., and Choy, E. 2020. Ecological and Biophysical Overview of the Southampton proposed Area of Interest for the Southampton Island Ecologically and Biologically Significant Area. DFO Can. Sci. Advis. Sec. Res.
    [Show full text]
  • Thomas Henry Manning (1911– 1998)
    ARCTIC VOL. 52, NO. 1 (MARCH 1999) P. 104–105 THOMAS HENRY MANNING (1911– 1998) Dr. Thomas Henry Manning, Officer of the Order of Canada, former Vice-Chairman and Executive Director of the Arctic Institute of North America, and famed Canadian Arctic expert, died on 8 November 1998 at Smiths Falls, Ontario, after a long illness. He was the author of more than 50 scholarly papers and reports, about half of them on zoo- logical subjects, but he was probably best known for his record as an exceptional Arctic traveller on land and sea. Tom Manning was born at Northampton, England on 22 December 1911 and educated at Harrow and Cambridge. Drawn to the North, he spent the summer of 1931 travel- ling in Iceland and the Faeroe Islands. The next year he hiked alone from France to Norway and from there, with a friend, continued by foot and by reindeer through Sweden and Finland and into the northern U.S.S.R., where the two men were arrested, imprisoned, and later deported. Tom Manning revisiting the Nauya in Igloolik, summer of 1983. The boat had Turning his attention to the (friendlier?) Canadian Arc- been renamed “Nauya” (with a “y”) at an unknown date. Photo by Brenda tic, Manning travelled in 1933 to Southampton Island in Carter. Hudson Bay, where he surveyed and conducted geographi- Between 1945 and 1947, Tom Manning was employed cal work under the auspices of the Royal Geographical by the Geodetic Survey of Canada. In the summer of 1946, Society and studied birds for the British Museum.
    [Show full text]
  • Atlantic Walrus Odobenus Rosmarus Rosmarus
    COSEWIC Assessment and Update Status Report on the Atlantic Walrus Odobenus rosmarus rosmarus in Canada SPECIAL CONCERN 2006 COSEWIC COSEPAC COMMITTEE ON THE STATUS OF COMITÉ SUR LA SITUATION ENDANGERED WILDLIFE DES ESPÈCES EN PÉRIL IN CANADA AU CANADA COSEWIC status reports are working documents used in assigning the status of wildlife species suspected of being at risk. This report may be cited as follows: COSEWIC 2006. COSEWIC assessment and update status report on the Atlantic walrus Odobenus rosmarus rosmarus in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. ix + 65 pp. (www.sararegistry.gc.ca/status/status_e.cfm). Previous reports: COSEWIC 2000. COSEWIC assessment and status report on the Atlantic walrus Odobenus rosmarus rosmarus (Northwest Atlantic Population and Eastern Arctic Population) in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. vi + 23 pp. (www.sararegistry.gc.ca/status/status_e.cfm). Richard, P. 1987. COSEWIC status report on the Atlantic walrus Odobenus rosmarus rosmarus (Northwest Atlantic Population and Eastern Arctic Population) in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. 1-23 pp. Production note: COSEWIC would like to acknowledge D.B. Stewart for writing the status report on the Atlantic Walrus Odobenus rosmarus rosmarus in Canada, prepared under contract with Environment Canada, overseen and edited by Andrew Trites, Co-chair, COSEWIC Marine Mammals Species Specialist Subcommittee. For additional copies contact: COSEWIC Secretariat c/o Canadian Wildlife Service Environment Canada Ottawa, ON K1A 0H3 Tel.: (819) 997-4991 / (819) 953-3215 Fax: (819) 994-3684 E-mail: COSEWIC/[email protected] http://www.cosewic.gc.ca Également disponible en français sous le titre Évaluation et Rapport de situation du COSEPAC sur la situation du morse de l'Atlantique (Odobenus rosmarus rosmarus) au Canada – Mise à jour.
    [Show full text]
  • The Southampton Island Marine Ecosystem Project 2019 Cruise
    Southampton Island The Southampton Island Marine Ecosystem Project 2019 Cruise Report 5-29 August MV William Kennedy SIMEP 2019 Cruise Report Table of Contents Section 1. Introduction .................................................................................................... 1 Section 2. Physical Oceanography .................................................................................. 6 Section 3. Biogeochemistry .......................................................................................... 14 Section 4. Phytoplankton .............................................................................................. 20 Section 5. Kelp .............................................................................................................. 28 Section 6. Zooplankton and Fish .................................................................................. 38 Section 7. Sediments ..................................................................................................... 44 Appendix: Ship Log ...................................................................................................... 49 Appendix: Phyto Net Log ............................................................................................. 71 Appendix: Sediment stations ........................................................................................ 79 SIMEP 2019 Cruise Report Section 1. Introduction Climate warming is forcing rapid change to Canada’s marine Arctic icescape (Hochheim and Barber 2010) and its associated ecosystem,
    [Show full text]
  • The Southampton Island Barren-Ground Caribou Population Management Plan 2011 – 2013
    The Southampton Island Barren-ground Caribou Population Management Plan 2011 – 2013 Prepared by: Coral Harbour Hunters and Trappers Organization & Nunavut Department of Environment Kivalliq Wildlife Research Station 1 TABLE OF CONTETNTS 1.0- SUMMARY 3 2.0 - THE SHI CARIBOU POPULATION AND ITS RANGE 5 2.1- SHI CARIBOU RANGE 5 2.2 COMMUNITIES THAT HARVEST SHI CARIBOU 8 3.0 - THE NECESSITY FOR A CARIBOU MANAGEMENT PLAN 9 3.1 – A HISTORY OF HARVEST MANAGEMENT 9 3.2 – HISTORY OF SUBSISTENCE AND COMMERCIAL HARVESTING 9 3.3 - ROLE OF THE CO-MANAGEMENT PARTNERS 13 4.0 - COMMUNITY INVOLVEMENT AND INFORMATION 14 4.1 - THE ROLE OF THE COMMUNITY IN CARIBOU MANAGEMENT 14 4.2 - INUIT QAUJIMAJATUQANGIT 14 5.0 - MANAGEMENT OF THE SHI CARIBOU POPULATION 15 5.1 – GOALS AND OBJECTIVES OF THE MANAGEMENT PLAN 15 5.2 MANAGEMENT PLAN PRIORITIES 15 5.3 – HARVEST MANAGEMENT 15 6.0 HERD MANAGEMENT 19 7.0 LEVEL ASSESSMENT 23 8.0 - RECOMMENDATIONS AND ACTIONS 24 2 1.0- Summary Wolves (Canis lupus) and barren-ground caribou (Rangifer tarandus groenlandicus) were historically abundant on Southampton Island until the early 1900’s. Extremely low numbers of caribou were being reported following 1924 (Manning, 1942). The reality of the situation was made obvious by the local extinction of wolves by 1937 (Parker, 1975). The extirpation of caribou from Southampton was complete by 1955, a result of over hunting by whaling crews in the early to mid 1920’s as well as by the need to maintain increasingly larger dog teams to meet demand for fox pelts (MacPherson, 1967).
    [Show full text]
  • Caribou (Barren-Ground Population) Rangifer Tarandus
    COSEWIC Assessment and Status Report on the Caribou Rangifer tarandus Barren-ground population in Canada THREATENED 2016 COSEWIC status reports are working documents used in assigning the status of wildlife species suspected of being at risk. This report may be cited as follows: COSEWIC. 2016. COSEWIC assessment and status report on the Caribou Rangifer tarandus, Barren-ground population, in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. xiii + 123 pp. (http://www.registrelep-sararegistry.gc.ca/default.asp?lang=en&n=24F7211B-1). Production note: COSEWIC would like to acknowledge Anne Gunn, Kim Poole, and Don Russell for writing the status report on Caribou (Rangifer tarandus), Barren-ground population, in Canada, prepared under contract with Environment Canada. This report was overseen and edited by Justina Ray, Co-chair of the COSEWIC Terrestrial Mammals Specialist Subcommittee, with the support of the members of the Terrestrial Mammals Specialist Subcommittee. For additional copies contact: COSEWIC Secretariat c/o Canadian Wildlife Service Environment and Climate Change Canada Ottawa, ON K1A 0H3 Tel.: 819-938-4125 Fax: 819-938-3984 E-mail: [email protected] http://www.cosewic.gc.ca Également disponible en français sous le titre Ếvaluation et Rapport de situation du COSEPAC sur le Caribou (Rangifer tarandus), population de la toundra, au Canada. Cover illustration/photo: Caribou — Photo by A. Gunn. Her Majesty the Queen in Right of Canada, 2016. Catalogue No. CW69-14/746-2017E-PDF ISBN 978-0-660-07782-6 COSEWIC Assessment Summary Assessment Summary – November 2016 Common name Caribou - Barren-ground population Scientific name Rangifer tarandus Status Threatened Reason for designation Members of this population give birth on the open arctic tundra, and most subpopulations (herds) winter in vast subarctic forests.
    [Show full text]
  • Movements and Wintering Areas of Breeding Age Thick-Billed Murre Uria Lomvia from Two Colonies in Nunavut, Canada
    Mar Biol (2011) 158:1929–1941 DOI 10.1007/s00227-011-1704-9 ORIGINAL PAPER Movements and wintering areas of breeding age Thick-billed Murre Uria lomvia from two colonies in Nunavut, Canada Anthony J. Gaston · Paul A. Smith · Laura McFarlane Tranquilla · William A. Montevecchi · David A. FiWeld · H. Grant Gilchrist · April Hedd · Mark L. Mallory · Gregory J. Robertson · Richard A. Phillips Received: 29 December 2010 / Accepted: 16 April 2011 / Published online: 12 May 2011 © Her Majesty the Queen in Rights of Canada 2011 Abstract The non-breeding movements of marine birds Minarets moved south rapidly post-breeding and wintered were poorly known until recently, but this information is principally oV Newfoundland and southern Labrador, or essential to understanding the risk to diVerent geographical between Newfoundland and southern Greenland, remaining populations from events on the wintering grounds. We south of 55°N until at least the spring equinox. Those from tracked the migration routes and wintering areas of Thick- Coats Island remained in Hudson Bay until at least mid- billed Murre Uria lomvia from two breeding colonies in November, after which they moved rapidly through Hudson eastern Canada: Coats Island in northern Hudson Bay and Strait to winter in southern Davis Strait and the northern The Minarets, BaYn Island, during the period August Labrador Sea, mostly north of 55°N. Many individuals 2007–May 2008 using geolocation loggers. Birds from The stayed throughout the winter in areas of heavy ice cover. Adults from the two colonies appear to be completely segregated in winter and those from Coats Island probably did not enter the area of the winter hunt in Newfoundland.
    [Show full text]
  • Birds of Mansel Island, Northern Hudson Bay Anthony J
    The Canadian Field-Naturalist Birds of Mansel Island, northern Hudson Bay Anthony J. Gaston Science and Technology Branch, Environment and Climate Change Canada, Carleton University, Ottawa, Ontario K1A 0H3 Canada; email: [email protected] Gaston, A.J. 2019. Birds of Mansel Island, northern Hudson Bay. Canadian Field-Naturalist 133(1): 20–24. https://doi.org/ 10.22621/cfn.v133i1.2153 Abstract A recent review of bird distributions in Nunavut demonstrated that Mansel Island, in northeastern Hudson Bay, is one of the least known areas in the territory. Here, current information on the birds of Mansel Island is summarized. A list published in 1932 included 24 species. Subsequent visits by ornithologists since 1980 have added a further 17 species to the island’s avifauna. The list includes 17 species for which breeding has been confirmed and 10 for which breeding is considered prob- able. The island seems to support particularly large populations of King Eiders (Somateria spectabilis) and Tundra Swans (Cygnus columbianus) and the most southerly breeding population of Sabine’s Gull (Xema sabini) and Red Knot (Calidiris canuta; probably). Key words: Mansel Island; Hudson Bay; birds; breeding Introduction leaved Mountain Avens (Dryas integrifolia Vahl) and At 3180 km2, Mansel Island, Qikiqtaaluk Region, Purple Mountain Saxifrage (Saxifraga op po sitifolia Nunavut, is the 28th largest island in Canada. It is L.). Marshes support extensive sedge (Carex spp.) one of three large islands in northern Hudson Bay, meadows. the others being Southampton and Coats Islands. The Hudson Bay post on the island closed in 1945, Although the birds of Coats and Southampton Is- and there has been no permanent habitation on the lands have been documented (Sutton 1932a; Gas ton island since then, although people from the nearby and Ouellet 1997), those of Mansel Island are com- Inuit community of Ivujivik, Nunavik, sometimes paratively poorly known.
    [Show full text]